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The Beginning Of Life On Earth
When the Earth was first formed as we know it today ie with its position in the solar system and the moon. We as oxygen breathing animals, couldn't have lived there. The Earths surface was being bombarded constantly, by comets, meteors and other space junk. Life as we know it was just not possible. But today, scientists believe that they can trace life back as far as 3.5 billion years. They have found single celled life in fossil rocks dating from that far back. How did it get here? They believe it came from the very same thing that killed the dinosaurs. Comets. A comet is in fact, just a dirty ice ball. But they are capable of bringing all the ingredients to start life. And of cause if they are made of ice, they also gave us our water. As the bombardment stopped, the seas and oceans began to form and the earths crust began to harden. Life started to get a foot hold. The scientists believe that it all began around hydrothermal vents, or hot water outlets. Such as the ones that can be seen in Yellow Stone National Park. These creatures today are known as Extremophiles. They are some of the most primitive life forms that can be found. For millions of years that was how things stayed. Then we find cells starting to group together to form what we know call Stromatolites. You can still see some living examples of these creatures at a place in a shallow bay in Australia. These creatures used photosynthesis to feed themselves. As they turned the suns light into energy, the by product was oxygen. Which is where the next part of or story begins.
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